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1
Heat the oven to 250 degrees F (225 degrees F if you have a convection oven).
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2
Line two sheet pans with parchment paper or silicone baking mats.
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3
In a stand mixer fitted with the whip attachment, beat the egg whites on low to medium-low speed until they form soft peaks, 2 to 3 minutes.
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4
Increase the speed to medium and beat in the sugar 1 teaspoon at a time.
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5
Beat until the mixture is glossy and thick; it will resemble marshmallow cream.
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6
Remove the bowl from the mixer and scrape any meringue off the whisk.
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7
Sift the cornstarch over the meringue, add the vinegar and vanilla, and gently fold until everything is incorporated.
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8
Dip a very large spoon into warm water.
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9
Let excess water drip off, then scoop into the meringue.
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10
Drop the meringue onto one of the prepared pans; the shape of the spoon is oval, so when you place the meringue on the sheet pan, it should resemble a jumbo egg.
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11
Continue scooping, rinsing the spoon in warm water after every scoop for neat, smooth meringues.
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12
Bake the meringues into the oven and bake until they are very light and dry and easily lift off the pan, at least 90 minutes.
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13
If they start to color slightly, lower the oven by at least 25 degrees F. Don't rush the meringues; when in doubt, leave them in longer.
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14
Turn off the oven (don't open the door).
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15
Let the meringues cool slowly in the oven for 30 to 40 minutes.
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16
Remove the pans from the cool oven.
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17
The meringues are ready to be filled when totally cooled.
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18
Fit a piping bag with a doughnut-filling tip or a plain number 5, 6 or 7 tip.
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19
Fill the bag with the Nutella or (or chocolate, vanilla or butterscotch pudding).
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20
Flip each egg over and, with a melon baller, make a hole just large enough for the tip of the piping bag to fit.
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21
Squeeze the filling into an egg just until you can see that it's starting to come out.
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22
Flip the egg onto a serving platter.
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23
Continue until all the eggs are filled.
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24
Instant birthday party!
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25
Mark my words, this will become the new birthday cake.